Turbine blade mounting



Nov. 3, 19

CKER April 5. 1930 I 2 Shee -she 2 Patented Nov. 3, 1931 p ATaN-r orrlca UNI-Tao STATES P WILLIAE B. noun, or MILWAUKEE, wrsconsm; assrenon. ro ALLIS- mmuraornnme comm, or mrwanm WISCONSIN, A conrona'non or nnmwm Y a a momma 3mm uomme Application filed April-5, ieso. Serial Ho. 441,821.

1m rovements in the art of mountmg a plu-- thereof. y I rahty of elements upon a support, and relates Fig. 4 is a radial section through a fragmore specifically t an improved method of ment of a rotor at the place of attachment of and apparatus for rigidly but detachably 'a special blade thereto, showing a fragment fastening a group ofblades to a supporting of a special blade in position preparatory to rotor or casin attachment thereof. a

An object of the invention is to provide an Fig. 5 is a top view of two normal and an :improvedmethod of firmly attaching a group of blades or thelikeg a support such 5x541 during the process of attachment thereof to rotor, in such a mannertlfitithe blades may a fragment of a rotor. be readily removed without damaging the support. Another-object of the invention is ment of a. .rotor, similar to that of Fig. 4, to provide simple and efiective instrumentalishowing a fragment of a special blade durties for enabling commercial exploitation of ing the process of attachment thereof to the the improved method. A rotor.

It isnecessary in the construction of high Fig. 7 is a view similar to that of Fig. 6-, speed rotary machines such as steam turbines, showing the ecial blade fastening further to firmly attach the (blades to the rotor, and, advanced during the process of attachment 9 when the blades are large and of relatively to the rotor.

costly construction, it is also desirableto pro- Flg 8 is a View Similar to that of Figs. videa mounting which will permit removal 6 and 7, showing the process of attachment of the individual blades without damaging of the special blade at a more complete stage either the blades or the support. The pres- Fig. 9 is a view similar to that of Fi s. 5 ent invention contemplates improvements in 6, 7 and 8, showing the s ecial blade fin turbine blademountings, whereby bl 'des of locked to the fragment 0 the rotor. various sizes may be firmly locked to a sup- F g. 10 1s a top view of two normal and port, but which will permit conv nient rean mtermedlate speclal blade, showing the moval of the blades, and re-assembly of the blades finally locked to a fragmentof a rotor, structure, without damaging the parts. Flg. 11 is a top view of two normal and an Other advantages attainable with the present Int rmcdm e eclal blade, showing a modiimprovement will appear from the accomfied form of al locking arrangement for panying detailed .descri tion. the speclal blade. a A clear conception o the several steps of Fig. 12 1s a fragmentary side view of a the improved method, and of the mode of conr tor and bladmg, showing the mode of apstructing a bladed rotor in accordance with P11083011 v a spe a 1 g 1 811 for the purthe invention will be apparent from the acpose of fasten ng the special locking blade companyin drawings in which like reference 11 p os1t1oncharacters jesignate the same or similar parts Fig. 13--1s a iirtlieaseveralviews. F1g.'1"is a' top view of three normal blades showing the attached to a fragment 0 a supporting rotor. p p v Fig. 2 is a radial section through a fragone or morapenpheral annular grooves 21 H mentof a rotor having a fragment of a ROI-199,011 of l h has s rratlons 12 mthe oppomal blade attached thereto. I 4 site side walls thereof, as shown 1n Figs. 1

Fig; 3 is a top view oftwo normal and an intermediate special blade, "showing.thenormal blades attached to a fragment of a supporting rotor and also showmg'th'e Fig. 12.

In accordance with the improvement, the

vided with one or more local lateral recesses fragmentary radial section flthrough the rotor and through the jig of" or enlar ements 16 asshown in Figs. 3 and- 4,",of a size to permit insertion into the adc The present invention relates ingeneral to blade in position preparatory to attachment vISIS intermediate special blade, showing the same Fig. 6 is a radial section through a fragrotor or support-2 may be provided'with and 2.- Each of the grooves 21 is also pro- Q I v 3 I Jacent grooves 21, of blade bases ha transverse cross sections snugly fitting the groove. The-lateral enlargement 16 extends awa from the adjacent groove 21, a distance slig tly greater 'than the depth of the serinserted into the groove 21 at the enlargement 16, andsubsequently slid along-the groove to their final normal blades 4 have portions of the in Figs. 3 and 4, w1th the base of blade 3,

,the end as a plane inc ed surenlargements 13. This may either be fittedand subsequentl v into place, or it may consist of meta into the enlargement or space, while in molten condition. In Figs. 5 and 6, the blo;k

'19 has been fitted and driven into space and has an enlargedupper portion 8. The block 19 snugly engages the base of theblade3 along the Y plane side surface thereof, and should likewise snugly fit the walls of the enlargement 16. Y

After the core 19 has been inserted, a ig 5 such as shown in Fi 12 and 13 may be ap plied to'the rotor. e jig 5 is'provided with 4 positioning dowels 6 whlch are adapted to engagedrilled holes in'the i-otor, andmay be held firmly in position by means of a jig clamp 7 coacting directly with the jig 5 as shown. The clamp 7 is secured to the outer end of a clamping rod 9, the inner end of which is screw threaded. An inner clamp 10 embraces the threaded end of the rod 9 and a core driven I poured nut 11 coacting with the screw threaded portion of the -rod 9 serves to draw the 10 together and to thus firmly lock in lace. p r

h'hen the ji 5 has been thus pro erly rigidly position holes ma 'bedrilled? through the core 19 by utilizing t e threaded holes 20 5 of the jug 5 as 'des, or a special drillin'gjig be used w ich clamps 7, the jig 5 19, and should be drilled the bottom of the adjacent groove 21. en these holes have been iezitions, After the t d looseness entire core19 with in 20 andsnu' l fitt' theseo e ma; to fo ni scrdi v threads the di'ille ment16.

With the tapped holes 13thus formed, re

plugs 14 may be insertei ammg screws 01 Fig. 8. The screw plugs 14 should snugly fit ,the tapped holes 13 in order to eliminate between theinterconnected parts When the plugs 14 have been driven home, the enlargement 8 of the core 19 together with the upper portions of the screw p ugs 14 may be out 01f as. sho in Fig. 9. The projecting 14 and the enlargement 8 of the core 19 may be'removed flush with the outer surface of the rotor 2 as shown in Fig.9, or the plugs 14 may be permitted to lproject slightly beyond this surface and e provided with transverse end slots in order to permit most convenient removal thereof wlth a screw. dr ver. After as been thus finished, a relainserted between the adjacent screw (plugs 14, in order to avoid possibilit of un esirable unscrewing of the plugs 1 This locking screw 17 may be dispensedwith, in favor of another screw plug 18 drivenin between the original plugs 14, as shown in Fig. 11, thereby substantially replacing the screw plugs 14, 1,8. The screw threads of the plugs -14, 18, 'in every case, should coact ith the rotor 2 and with the base of the blade 3, in order to eliminate any possibility of loosening of the blade 3.

If, however, it becomes desirable to remove the blading from-a groove 21, the screw lugs 14, 18 may be readily removed either by orming a slot in the end of each plug and un-' screwing the same with the use of a screw driver, or by utilizing the same jig 5 that was used in the formation of the threaded holes 12, {gr the purpose of drilling out tlTe plugs 3 When it is desired to replace the special blades 3 withpther such blades, the

with the original threads in the rotor. A

From the foregoing description of the structure and of the paratus u ilized in l producing the same, it

Wlll be apparent that 1:

the blades 3, .4 may be firmly locked in tion within the grooves 21 and cannot become displaced during normal operation of the machine. The blades may however be readily removed. without marring either the suport or the blade bases, and may be repisaced 'y other blades.- The attachment may ap-' plied to blading for either a rotor or a stator, it obviously being possible to utilize a jig ar-" rangement similar to that shown in .Figs. 12 and 13, when applying a blade to a stator. In case the sup ort 2 is of large diameter thereby making t e groove 21 relatively long, several enlargements of each groove 16 may be utilized, thereby reducing the time required for assembling or dismantling of the structure. The small ji holes for receiving the positionin' pins 6 0 not have to be drilled deep and t erefore are not objectionable in a rotor of this t e, and these holes permit accurate positioning of the jig 5 whenfastenin ,detachin or replacing the blading. The

ho es 20 of c ji 5 accurately guide the drills and taps and insure possibility of removing thescrew plugs 14 without undesirably marrin the support 2 and the base. of the blades 3. e filler cores 19 facilitate proper drilling and tapping of the threaded holes 13 without danger of breaking the drills and taps, and the entire assemblage is not only rigid but presents a neat final appearance.

It shoul I sired. to limit the invention to'the-exact details of construction and to the. precise mode of attaching blades herein shown and described, for various modifications within the removably disposed within said enlargement,

and a plug for locking said core within said.

enlargement, said plug having screw threads interlocking with said support and said blade base adj oimng said enlargement.

support having an annular groove provided withside serrations and with a local enlargement at one side thereof, blades having bases insertahle in said groove only at said enlargement, said bases having projections cooperable with said serrations to retain said bases 7o 4. A turbine blade mounting comprising, a A

within said groove, and a screw plug insert- I be understood that it is not descope of the claims may occur to persons skilled in the art. V

It is claimed and desired to secure by Letters Patent: a r

1. A turbine blade mounting comprising, a support having a groove provided with a local enlargement, a plurality of blades havin adjoining bases substantially filling said groove, a core located within said enlargement and coacting with an adjacent blade base, and a-locking plug embedded in said core and interlocking with said support and said blade base.

2. A turbine blade mounting comprising, a support having an annular groove provided with a local enlargement, a plurality of blades having adjoining bases interlocking with the sides of said groove, a core substantially filling said enlar ement and coacting with an ad acent blade se, and a plug embedded in said core and having screw threads interlocking with said support and said blade base. v

3. A turbine blade mounting comprising, a sup ort having an annular groove provided wit serrated sidewalls and with a local enlar ment at one side thereof, a plurality of es havinlbases rovided with projectlons interloc g wit said serrations, a core 

